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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837b4fcd76d97a4eb1e041fe7711751e650f64368ea2427aae930b8e6d20a77a' 
  AND token = 'wEYyIEccg3C2PTZNgv/6D1iygrjFhegSX3SAKBIYVBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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