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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41281dbd3e77f9a457662976a90bd98210a8e3cd716a68e9ffc17d61923f57d3' 
  AND token = '+QWzC3vzWwXZNFFoON/6TgvI1iR8kIjEyk2Ah0puDeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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