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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee6b5b7aa99ce33a8dc4a9ac3c3b6ad3fd18c77bc1644b52ed8f37f466dd893' 
  AND token = 'y9ulydwYHLT5diUyWpFhj2SM3ouARUzaU7tyzo4tvio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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