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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa3eb571dc38d96c2670e9f56c47d7f5517b33ac9cdc42d98d37b912dc359a9' 
  AND token = 'eF3hXrY5Z1mq49n987JHSe96gztplDDxIBjO8HJjgPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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