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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29438efff1e3c860a618caef110943d6ae50633310b0f9f61d2ec5817ca6f56b' 
  AND token = 'IsMF4hO0lmJDJDovs5Jg9vyAHdfqmh7Vv2GfoJSZZmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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