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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc954903c7659c7f0c87d386465bf1b552358caed6f70394d4c747b7950d17cc' 
  AND token = 'o3B1SDLqiMVPuiWPP4fL7FYRPbD/HrzomqUo77d8jj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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