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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52ac0d203137db02915b348243d3d6e2919de56c4535c97e3df11d88203f2b8e' 
  AND token = 'YOg+nFbAPvgf8NceQy0IN/UNO1HjE1z5myhBtcsf+/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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