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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbfbdc23a7ffafaa6ed1baa1fb360155eb3f67ab6dc90a8475976e090729274' 
  AND token = 'wCMHQT+oXR27QXiqZ22GrEm7VAqoQGrjEbq5xt2YOiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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