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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '301ba31a98d5f3271440c5a432e5988aad885fdaafc81023e48056236efcd354' 
  AND token = 'na+542aI4oVrl87KCoRj/oCanYglPSDNHdpfIMnA3aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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