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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23bb45e9d0a9fbd79b1e9a5b1929e5f26f753a6403f7d7dcd7c0bebabbf9715' 
  AND token = 'SDzAJYqpOqk0WvSRbDCd3l+O/IW2O2plxvQqj3WSKPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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