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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8682f53afec389a00c8d598c2c3c8f6a203928806c4db02d5c545ccb4c82081e' 
  AND token = 'TlSavHhUhWFiAiFJaPsq5u3KiAVa0cUwtI4x+J5haiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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