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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b6d4b19c7b69eb924cf9be8d0d8d034501e45c25c778603e454d73146b56d6' 
  AND token = 'D4pabD2dIiV958zXibG16LBVY97KO5u0Frm3KDw2w1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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