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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f524fd300d74fb181a34b206b608960f2c11aa5474768366184e5331d8e1954' 
  AND token = 'scTb89Qc+My0yr49N+W+vcOlObUPSLvreushW29O8P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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