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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7aa83d43756e71627b7b1b17e80ec1e66db931394424edc0c4be029d16acfc16' 
  AND token = 'y12h0wl8EurAbnmRY0SQOb4zMsVUL3GcG9ThNthq6Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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