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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a91e6bb0814b245686afa8148180f504c97aaba7ee2cb940702bed27a06b6f93' 
  AND token = '/kW57nPkE4kNd4leBwudaUS7sHaYaleS5+Vj/41berE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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