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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf30132576ab7758cf6782091b96703070c69ab8428af35e5ef1d343b120e701' 
  AND token = '6lmWDigiWZZ/QUCtjzoXV5mLE93bj0teLZ6wnyJ2M7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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