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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0a8091be167b48c99213b6afc83a560d187cb3d597f92cb581c9f73ee7795cb' 
  AND token = 'KQteLIupJEitZYt6FD/lSU/5H3zP3Vl1Rd4udH5y2Ac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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