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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd03e6582cfaefd187212f48d7326842cd30bbbc8b7d1b1c76a024d8c2010df14' 
  AND token = 'vfwN1ckJ9RNEsG9IxFA4tG2il6qzXtNbmK7YgHHNOEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00147

JSON explain

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