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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c2403c2358ce369d317f4d61d7b75d71d72e9f915735900085365b420fc5644' 
  AND token = 'LXHegKMfpdVrkok27UpEsBHmk3/rwbPnDGqxGEZCaMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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