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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac261876f05a9e18515192f1f6cdac8922899c20dd9a587aa66a8506ae8e710c' 
  AND token = 'oLoa8lZusT34xHkzutKCzV78T5FzsvyIT0sl7O0WPR4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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