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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43ddf0f5c6acf7ecaed03069185cf4d8426fda5f556b68afb836a637089d5dbe' 
  AND token = 'oINQwzeEKrObuS7fsQzvKUu7zizU9arRgnLqE9nAc8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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