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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b229f86d620b82007cc9747b6e8fce0670a802bce84903eb448fbdf3363ca333' 
  AND token = 'DnbzTCQMmoEpWGKtV/rg5o+j9lbO4crR0gdP0sOE9+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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