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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f6c33869b894cf423db0414292f2c5115e2e5d51b539a2cf3a8d0249ce48ce' 
  AND token = 'nqwIHb3EKoUtMQT3cjKIjU+U5a6605E526J+O+/Tk3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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