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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a0745050ab01458d3dbff1e0172b86391398cf339a29a980249b82439e00884' 
  AND token = '987+PHmMiqNOuNfbLQJrXpLFoELBW/oV/WTKGs6qfuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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