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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd98b8946317e31ccfaf4d668a69e3b6f5040d7cc454efd610998c619cd6ac2d5' 
  AND token = 'VNApC3jotg77KXpYScCRePg0aC373iCVZjMFkhtQ8Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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