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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0ab2e247c96f6b487c78b109afa6b6dabe4892db63575256e5a60aa38f9a9b' 
  AND token = 'ldDgmR9+Q9bxI4DaIKVlDDhUm3TNULxX71cr7P7vM8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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