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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb27040559e6c775196f1de968ee299a14867d66bfbec4d415d39e6b47f44f1' 
  AND token = 'tTf3W2N2efQ90vDWsKBEbKh9iTHSamJ94CFPrjO/u+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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