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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca744e41ff0858e25e1067e847a1e2b8efec17d0060bc659b07506b8d49370e' 
  AND token = '5lFK54W5gU9Cbqa7tjjGFiywsvxMdIufAc3tlJfGcpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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