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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd5733755b561fff4239eef913f8174a94d8dacbf5196003afdf3ed9261c85a' 
  AND token = 'voRv2ZNvqRo7SY0dmfq4dtxm/yoox8ibjlliH+BJIoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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