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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db995e35fee5d8d7e39aec2dee25758dfd3f86ffe7b00e9fab7a9b4613123a0' 
  AND token = 'teyP+bkcZw5d/7yqStYc0TJCkGWeDA23SbWH6V8Q7DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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