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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11533c7a6b07475a188ea657ab2dbb10a8c3b77b930875d7fbe8a88cd1e94f3b' 
  AND token = 'drNgX1o1cB0P20Oj86fosFcSexbcTZcg6IEub3DfaOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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