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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae48519bf7e55b2fff559065a0c724e4456284f9621a1bdea86ad4d1dc24aeb6' 
  AND token = 'hHphYcjMQ7t1suuJy6pxBZzFlDk1Vb+VcHsyRJMHyrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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