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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccda1411deaa2acbfa836106be505724132a19eec539954ade41513b4443651' 
  AND token = '6HSZMjzAazfQtRR7Hnd6BHdyWaWxRQbNCivAK6FaA/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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