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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8b88ac077ebb05c861171da68f3a6f610130a690a339fbb19c754ef9278989a' 
  AND token = 'vK6NumM/oezrV0KNN0P98Z68pKoVo8mLKOi9XLS/Mp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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