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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd924217ee1dd06189195b2a426caf952751c8e339ce715af667ee5432c47bd49' 
  AND token = 'ov3toEwjEZAcYV6O3lT4v/v52U2RCRPqqL3qQQVmt4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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