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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e69050c7d9eefb5e6a5ee3b4ef958cfcfd8187f974cd1ac2aa35c756ec68894' 
  AND token = 'EzJX5YC9XIveQ8jwBDyI5e3YnvwWcVKOjyLPM+B9jNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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