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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc2191560b808750f9ebcd80c6fea6cc6334a8d929a161c23d647360ff8beb42' 
  AND token = 'W/+MmKS7hSZkiheDDcF/2vXooNr+RzDk9RkgZ6ZCETo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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