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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a9f86a18237da9bbf3c9fee59ac55ca01903a6f9ec1a785c1061e50c6b7627' 
  AND token = 'RVyQW5zYg5Vdc3anR2tUQl+JCvneaJEzor52uyUXBHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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