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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45370630d7e8076c7c51b8a027fef6cad4bb1e4a5a57ef388844777f57e806e' 
  AND token = 'b8uyCO4cZ5qtqoRjfWgdpPepxc+GphKBaaqR8Ukdx3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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