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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8087007bf13da5d55e0f26130afdf66a2c27d7023ab910d6613e7eed0d729496' 
  AND token = 'cZCl2LhJXlKZanTOnI+4i9O8BdSO+VYT7rL9ysipTNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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