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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611abc77b4b23b0728436567d12cfa4845a57f0c87e5b4ff8f0dd30b6c87f64d' 
  AND token = 'UcD3YR1tUd2U1ee9qeKS0IYgWZwa0WlYlXvAA9/uGxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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