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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1519646d93e21da24ff827e0ecc60e65c24af0bac4487b32174e0832f15d02b8' 
  AND token = 'qG0Ioc+ah/VwuL6K3qrkAO73Jfafv6U+TOSvCCoHIrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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