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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564aa00763a4b6ace67271d2ff0a13b2a9e8cb705a3cb287557882ba17c6682a' 
  AND token = 'XEJr7SNsCA/ns6XNvayzN/JsRbCM0/RlXjly7MzIUJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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