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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99e85658b19daff9b7fac30a339dd3a763228e5bc36134b5e37e6b43f9d3484a' 
  AND token = 'VKQ3ULBDg7xQVFrsfW+uNQDpX7Syda+TdLBOjB45pMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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