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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ca238ad9d7098e268c6040e8baee7a27ab16ea6ba8a6c2750b39e77387fd4d' 
  AND token = '2NzJs53b6mHPFdqU8L8W+PPVyPIJyIrI24RPWHahoE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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