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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '122852bd3d1b7a71cba4ee17eb007857345f31cc4e278ba77b22a93cdc82b26a' 
  AND token = 'A8DAhjGtoYHiKijbj2/o4SCsIBzv0UYZ/Y3eOClxsHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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