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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '623f8267e1148608af63e9d7641b5f826e1c600ff50aaaa75a607d7a1911db3f' 
  AND token = '2NgaSSaBPj/7vFadohHTJB02BGAxBWUDKsW9gch79JI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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