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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a8632acfbae3cd6468ae234a5c61f7b8c0e9e95260e74b7ccb31cfd98b73863' 
  AND token = 'XTBpshItDqcfjgv5dkvFVoSwaDwVcyIaCDS5veEbOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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