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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab4baf43ce3d2da31da634e967a34e792a688310e07f266350fcb96c24b3329e' 
  AND token = 'n64uLrc4avyCaa6jwO1KM6R0Aprz9cVf7QqIwmyxukw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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