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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2e545e4310f097da4f7f15251d9c05e7fd3fca713cc8eec1d60981f7408a7b' 
  AND token = '0jn7eQpMGxfZGpgxbO/HkPYNcUYDFwUk6Lf/K6nXUk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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