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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb23d73f876f63fe073a3db8412c1d322eeb587ba445c2e2028c15336061768' 
  AND token = 'dab657rkTmXiP/sV4ZgmnS/VuBoAQtF3YvuBga0tCQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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