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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ac15863ed1d69a0772187b7c95ed7fa7b65947af2f2daccec699ff6e068f77' 
  AND token = 'ukapHiPb5nU4pONl/4PHieJMMkfbVE9SZGg00MmEzFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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