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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb5944990d0666f22bd0ae3422448438be710704d1266eecf5fd6715b9bd049' 
  AND token = '1mzEVC7/a+FYdsC4FJdgNNkqnLsCih6GKCjeRSFQTec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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