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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ea2c9eecc00aeff6884d47802614f5274cdac3c4fd963b381d583b7d42b9aa' 
  AND token = 'cNM1UijwyOxH3/+PfgkvZhxZQhcPQOJfwUQVyW9o8j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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