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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d18baf85e1f4f1dd49ed2a6595b3a9d02b53d3c08acf1e2cae3601cfd0f9aac' 
  AND token = 'wH4O201OL25RyPtnbVhAW1zxSK6NpH5hVuoXCUpFfsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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