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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf1a94540651e6637bf4149f1281d131cbe171dd7fa550757e75c933798aa453' 
  AND token = 'l7J35M4FI5oFT/a58Al8DqQ823TpEErh3AP+xoffKTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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