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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b44a25626ee5c666fe78a828bd4fd3c9aa70502961e3b892b6862b4749e4a65' 
  AND token = 'TYs4yKUGArBcpduY4rmJOirGYIqLl/M9Z5gt1pGWAeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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