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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf571f18fefdd4abe8983db31c5ac4f3071dd435004d2aefcef953a05718563' 
  AND token = 'FaxGOD26dffSyjDX4EdZk98pY/dyUpTCMPQiiQ2zOkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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