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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b2bc7f125044904d0f3a02c8fd006c8101ba124d84847a8a55251e633f0c7e' 
  AND token = '+W//8/dyRq8C2CgVlYtP5730/sHto69sFkXmrDK9kTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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