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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dac05c11e709349bfa6f1da75570a5c6b8c28d2065957a1651f3d0ee478e3b6' 
  AND token = 'SDXvwALAQh6o8SSyWhZVGRk0w3TGGfowq+53kIXE260=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}