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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4decddef43f1ecc075762d71077ac2bbbacaefe9d92fa9a02d37b00dd939aeb6' 
  AND token = 'zHbuA69y4fz7o4XDrQxPgWxGBGdCzf65W8tEZTIfGN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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