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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '672134a2ca065c3e118ee5edab46ef7341ee8274d32f3b8908702e493831cf44' 
  AND token = 'Wc9u9S38YtDwD2p0bPx6zvJJHJmuxtxIWS5XT9QkOpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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