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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a949bbaf176832a94dc74fb7bb2f7c4d11cccd46bf9b96dd40066ca304cdcd95' 
  AND token = 'lCHAHEuARvJDXZ274jWO+YntvzqDAt36xAPBWUPjmLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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