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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ab4b876591e96a060d4b95e51059fcd4d453cf68869eeda2d2a40fa2e77c46' 
  AND token = 'SKiVhk/vJhUntg09CmLX7j4flc74f4L2qTcnet+foN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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