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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eff017fd7bbf1a44175b1864e5b140d2ac993ba390fc3a50f1150671426bbc' 
  AND token = 'zgbqhbS/8LIEDkkOHqdooDoDT9YUtH2mda0Zjuvri/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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